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United States Patent | 5,520,446 |
Wilson ,   et al. | May 28, 1996 |
The instant invention is a positive shutoff valve for use on emergency vehicles so as to maintain air within a reservoir tank allowing immediate movement of an emergency vehicle upon start up. The shutoff valve is operated by a switch located in the operator's compartment of the emergency vehicle providing movement of a solenoid located in the shutoff valve which is biased in a normally closed position. A manual bypass lever is provided should the electric solenoid fail to operate correctly. The shutoff valve positively maintains air within the reservoir tank and is monitored by a low pressure switch and alarm sensor which will indicate low air pressure in the reservoir tank even when the vehicle is in an off position.
Inventors: | Wilson; Larry (5825 Sundance Ct., Jupiter, FL 33458); Smozanek; Wayne (18158 Jupiter Landing Dr., Jupiter, FL 33458) |
Appl. No.: | 365596 |
Filed: | December 28, 1994 |
Current U.S. Class: | 303/9.76; 188/170; 303/15; 303/71; 303/DIG.3 |
Intern'l Class: | B60T 013/22 |
Field of Search: | 303/9.76,71,15,68,69,3,9,13,14,15,16,18,78,DIG. 3,89,85 188/170,265 |
3272566 | Sep., 1966 | Clack | 188/170. |
3456988 | Jul., 1969 | Gibbons et al. | 303/9. |
4191428 | Jul., 1978 | Durling. | |
4824178 | Apr., 1989 | Petersen | 303/71. |
5118165 | Jun., 1992 | Latvala | 303/9. |
5172958 | Dec., 1992 | Sell. | |
5286095 | Feb., 1994 | Sell. | |
5370449 | Dec., 1994 | Edelen et al. | 303/9. |